Smoke alarm



FIG. 1 is a front elevation view of the smoke alarm;

FIG. 2 is a front perspective view of the invention shown in FIG. 1;

FIG. 3 is a top perspective view of the invention shown in FIG. 1;

FIG. 4 is a top plan view of the invention shown in FIG. 1; and,

FIG. 5 is a bottom plan view of the invention shown in FIG. 1.

The broken lines (where present) in FIG. 5 illustrate portions of the smoke alarm that form no part of the claimed design. 

CLAIM The ornamental design for a smoke alarm, as shown and described. 